I purchased the first five Tomb Raider games on GOG. I know the first doesn't have the soundtrack, so I'll have to get that elsewhere, but are there other modifications that should be made for that and the other four Tomb Raider games? Do they have controller support so I can plug in a PS3 or 360 controller?

If, like me you'll be put off by the blocky graphics in TR1 you can try Glidos. Made a great difference to me, and I used to play TR1 on the Playstation in 1996. I think the multipatch which should be included with the games offers controller support to some extent, but personally I'm using the Xpadder app which allows to map the pc keys on my Xbox 360 controller.

I love TR but I have no clue how anyone plays them with a controller. XD If I was without a keyboard for the 1st five games I'd be toast.